Suchergebnisse

PREFACE AND ACKNOWLEDGEMENTS -- SECTION I – IN THE BEGINNING -- CHAPTER 1. WADING IN ̶ INTRODUCTION TO THE FISH-BIRD -- General Discussion of Penguins and Substance of the Book -- An Impressive Number of Penguin Species: Evolution of Their Unique Capabilities -- Penguin Species Radiation and the Ontogeny of Their Watery World -- Penguin Evolution: Body Size and Climate -- Penguin Evolution: Radiation into Vacant Niches -- Penguin Evolution: Body Size and Crossing the Sea-Land Boundary -- CHAPTER 2. LAND AHOY! A TIRESOME BUSINESS -- Crossing the Land-Ocean Interface is Affected by Body Size -- Why and How Often do Penguins Come Ashore? -- Tying Land-life to the At-sea Life of Fish-Birds: Foraging and Breeding -- Success Vary with Prey Availability -- Molt ̶Necessary, Brief Respite from the Sea -- SECTION II – PENGUIN MARINE HAUNTS AND FOOD HABITS -- CHAPTER 3.FISH-BIRDS AT HOME IN THEIR OCEAN HABITATS -- Oceanographic Fronts and Water Masses Important to Penguins: General Discussion -- Penguins Require High Productivity Water Masses -- Large Scale: Oceanographic Boundaries and At-sea Distributions of Penguins -- Southern Boundary of the Antarctic Circumpolar Current -- Emperor and King penguins -- Adélie and Chinstrap penguins -- Antarctic Polar Front and Subantarctic Front -- Gentoo and Yellow-eyed penguins -- Macaroni and Royal penguins -- Northern and Southern Rockhopper, Fiordland, Snares penguins -- Subtropical Front and Continental Boundary Currents -- Galápagos, Humboldt, Magellanic, African penguins -- Little penguins -- Meso- and Small-Scale Ocean Processes Facilitating Penguin Exploits -- Island wakes -- Headland wakes -- Shelves and banks -- Submarine canyons -- Shelfbreak fronts -- Marginal ice zones -- Thermo-/haloclines -- CHAPTER 4. SEA FOOD ̶ THE FISH-BIRD MENU -- General Considerations -- Diet Quality: Survival in Cold Water -- Energy density of prey -- Prey size may or may not differ by penguin size -- Prey availability -- Diet Comparison among Penguin Species -- Polar/subpolar, mesopelagic penguins -- Subpolar, demersal/benthic, continental-shelf penguins -- Temperate, upper water column, continental-insular shelf penguins -- Polar, upper water column, continental shelf/slope penguins -- Subpolar, upper water column, continental slope/pelagic penguins -- Polar, upper water column, continental slope/pelagic penguins -- CHAPTER 5. ECOLOGICAL CONSEQUENCES OF DIET COMPOSITION -- Intraspecific Competition among Penguins -- Foraging Range is Key: General Discussion -- Penguin Species' Central-Place Foraging Range Patterns -- Sex Differences in Foraging -- Interspecific Competition Involving Penguins -- Penguins Eat A lot! -- Competition between Penguin Species -- Competition between penguins and other seabirds -- Competition between penguins and marine mammals -- Competition between penguins and industrial fisheries -- SECTION III – THE HARDWARE OF A FISH-BIRD -- CHAPTER 6. THE SLIPPERY SHAPE, HOT AIR AND THE POWERHOUSE – HOW FISH-BIRDS SWIM -- Water – Hard Taskmaster -- The Four Forces Relevant to Penguins -- Vertical Forces – Weight and Upthrust -- Buoyancy: How Much Air Do Penguins Hold? -- Buoyancy and Bergmann's Rule revisited -- Horizontal Forces: Drag -- The Interplay of Drag and Upthrust in Gliding Penguins -- The Drag Devil is in the Detail -- The Penguin Powerhouse -- How Penguins Swim -- The Effect of Upthrust and Body Angle on Penguin Thrust and Lift Forces -- Top Speeds; Power and Upthrust -- The Energy Costs of Swimming -- General considerations -- Specific considerations -- 'Sensible' Swim Strategies and Costs of Transport -- Cruising speed and integrating speed with the cost of transport, -- and beyond -- CHAPTER 7. HOT PENGUINS ̶ COLD WATER -- Resting and Floating Penguins -- The Metabolic Rate of Floating Penguins -- Patterns of Heat Loss to the Sea -- Overall Body Insulation/Conductance -- The Nature of Penguin Insulation -- Active Penguins -- Activity Produces Heat -- Greater Depths Impose a Higher Heat Tax -- Consuming Prey Imposes a Heat Tax -- Embracing The Fish in the Fish-bird -- CHAPTER 8. FISH-BIRDS – THE INSIDE STORY -- Diving Physiology -- Surface issues – Uptake of oxygen -- Oxygen Management Underwater -- Role of the Air Spaces -- Gas Exchange to Body Tissues -- The Aerobic Dive Limit and Beyond -- The Importance of Size in Dive Performance -- Duration -- Depth -- Penguins Under Pressure – Beating the Squeeze and the Bends -- Barotrauma -- Beating the Bends -- A Gut Reaction in Fish-Birds -- Gastric Emptying -- Rotting Food -- The Eyes Have It -- SECTION IV – THE SOFTWARE OF FISH-BIRDS -- CHAPTER 9. EMBRACING THE DEPTHS - THE PENGUIN DIVE -- Submergence -- The time underwater – basic dive descriptors -- Dive profiles -- Dive distance-depth profiles -- Dive aspect ratios -- Horizontal dive directionality/tortuosity -- The Multifunctionality of Dives -- Basic dive types -- T-dives for travelling -- V-dives (water column assessment) -- P-dives (parabolic – prospecting with no prey capture) -- Po-dives (parabolic dives with circular trajectory) -- U-dives (depth-directed prospecting) -- W-dives/Up-dives (U-dives with prey pursuit) -- Depth Duration Effects Over Multiple Dives -- CHAPTER 10. FISH-BIRD STRATEGIES ̶ THE SEARCH FOR FICKLE PREY -- Decisions, Decisions, Decisions – How Fish-Birds Search for Prey -- Heading in the Right Direction -- Dealing with Prey Patchiness -- In-depth Considerations: -- Time-based efficiency -- Energy-based efficiency -- Superficial Considerations: Surface Pauses and Inspired Tactics -- Being Picky about Food -- Fish-Birds and Smart Strategies -- CHAPTER 11. THE FINAL SECONDS – HOW FISH-BIRDS CAPTURE PREY -- Prey Acquisition, a Departure from the Dive 'Norm' -- Performance Metrics for Prey Capture -- Catching Solitary Prey -- Changing buoyancy with depth affects prey capture strategies -- Prey pursuit against interfaces -- Exploiting Aggregated Prey -- Crustaceans -- Fish -- Non-corralling feeding behavior -- Clarity on Limitations of Penguin Vision -- SECTION V – PENGUINS IN A FICKLE ENVIRONMENT -- CHAPTER 12. TURNING THE TABLES – FISH-BIRDS ON THE MENU -- Basic Law of the Sea: Big Fish Eat Little Fish -- Seals as Predators -- Seals' hunting behavior -- Penguins avoiding seals -- Fur Seals as Predators -- Sea Lions as Predators -- Killer Whales as Predators -- Sharks as Predators -- CHAPTER 13. PENGUINS ADJUSTING TO A CHANGING OCEAN -- Penguins Have Always Been Challenged by a Changing Ocean -- Prehistoric response to a changing ocean -- Possible prehistoric changes to penguins' food web -- The Anthropocene: How will Penguins Cope, Now Also Dealing with Humans? -- Response to long-term climate change -- Response to short-term ocean climate variation -- Response to marine pollution -- CHAPTER 14. NOT FORGETTING ̶ -- The Social Side - Behavior and Communication at Sea -- Penguin flock fusion/cohesion -- Penguin flock fission/fragmentation -- Navigation -- Long range -- Medium to short-range -- Understanding the Daily 'Wash' -- Air flux in diving penguins, an aspect of 'washing' -- Are Auks Really 'Northern Penguins'? -- Research Tags – the Flip Side for Evolutionarily-Honed Fish-Birds -- SECTION VI -- CHAPTER 15. PENGUINS ̶ WHY THE HYPE? -- Sources of Hype -- Us -- Many people -- Researchers -- The Transition -- The fascination of species -- Beyond the transition -- Role in Ecosystems -- Biomimicry -- Our Last Word.